It’s loading that content in a different way than it loads content when you’re logged in. The logged-in-way got blocked, but the logged-out-way didn’t.
“When users are logged out, the app is still working because it does not use the OAuth client credentials while logged out,” developer Andrew Shu tells The Verge in an email. However, he expects that the app will stop working in this way soon. Many third-party apps finally shut down on Friday.